Question

difference between a bacterial cell and an onion peel cell

Answer 1

a bacterial cell does not have a defined nucleus where as onion cell has a peripherial nucleus
both have cell wall
but bacteria being an eukaryote doesn't have other cell organelles which onion cell has

Answer 2

Bacteria cells are prokaryote, that is they have a lose gathering of genetic material and few organelles, ribosomes being the most of that. Cell walls.

Onion cells are plant cells that are eukaryote. They have membrane bound organelles and a membrane bound nucleus for the genetic material. Like bacteria, plants have a cell wall.